Agilent Technologies ESA-E Series Programmer's Manual page 207

Language Reference
DISPlay Subsystem
Default Unit: dB
Remarks: The sum of (reference level offset + reference level) i s
clipped to the range -327 .6 to 327 .6 dB . The maximum
limits are determined by the setting of the first of thes e
two parameters, within the boundaries of their
individual limits when initially set .
For example, if the reference level is (first) set t o
-20 dBm, then the reference level offset can be set t o
values of -307 .6 dB to 327 .6 dB . In the case of a
327 .6 dB reference level offset, the resultant referenc e
level value changes to 307 .6 dBm . The reference level
value range can be intially set to values from -149 .9 to
55 dBm.
Setting the reference level offset value first yields th e
following: If the reference level offset is (first) set t o
- 30 dB, then the reference level can be set to values of
- 327.6 to 25 dBm . The reference level is "clamped" a t
25 dBm because its positive value of 55 dBm is reached
at 25 dBm with an offset of -30 dB. Its own positive
amplitude limit applies.
If the reference level offset is (first) set to 30 dB, the n
the reference level
can
be set to
values
of .27 .6 to
85 dBm. Again, the positive amplitude limit o f
reference level (alone) is factored in to the resultan t
combined limit.
Front Panel
Access :
Amplitude Y Scale, Ref Level Offst
Vertical Axis Scaling
:DISPlay :WINDaa:TRACe :Y[ :SCALe] :SPACing LINearLOGarithmi c
:DISPlay :WINDow:TRACe :Y[ :SCALe] :SPACing?
Specifies the vertical graticule divisions as log or linear units .
Factory Preset
and *RST: Logarithmic
Front Pane l
Access :
AMPLITUDE/Y Scale, Scale Type Log Li n
Chapter 5 5-47